Note 11 - Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

September 30, 2019	Ounces/pounds under contract (in 000's)								Average price per ounce/pound
	Silver		Gold		Zinc		Lead		Silver		Gold		Zinc		Lead
	(ounces)		(ounces)		(pounds)		(pounds)		(ounces)		(ounces)		(pounds)		(pounds)
Contracts on provisional sales
2019 settlements		828		3		16,204		2,921	$	18.66	$	1,537	$	1.09	$	0.90
Contracts on forecasted sales
2019 settlements		—		—		—		4,409		N/A		N/A		N/A	$	0.95
2020 settlements		—		—		—		4,960		N/A		N/A		N/A	$	0.96

December 31, 2018

Ounces/pounds under contract (in 000's)

Average price per ounce/pound

Silver

Gold

Zinc

Lead

Silver

Gold

Zinc

Lead

(ounces)

(ounces)

(pounds)

(pounds)

(ounces)

(ounces)

(pounds)

(pounds)

Contracts on provisional sales

2019 settlements

842

4

18,450

2,700

$

14.69

$

1,260

$

1.15

$

0.89

September 30, 2019	Ounces under contract (in 000's)				Average price per ounce
	Silver		Gold		Silver		Gold
	(ounces)		(ounces)		(ounces)		(ounces)
Contracts on forecasted sales
2019 settlements		2,493		89	$	15.08	$	1,400
2020 settlements		2,634		51	$	15.00	$	1,400